On Fri, Jun 09, 2017 at 01:23:51PM -0700, Dan Williams wrote: > Implement a __copy_from_user_inatomic_flushcache, memcpy_page_flushcache, and > memcpy_flushcache, that guarantee that the destination buffer is not dirty in > the cpu cache on completion. The new copy_from_iter_flushcache and sub-routines Wouldn't writethrough be a better name? > will be used to replace the "pmem api" (include/linux/pmem.h + > arch/x86/include/asm/pmem.h). The availability of copy_from_iter_flushcache() > and memcpy_flushcache() are gated by the CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE > config symbol, and fallback to copy_from_iter_nocache() and plain memcpy() > otherwise. What is UACCESS about memcpy_flushcache?
